Accounting machine



Jan. 27, 1942. G.NELSON ACCOUNTING MACHINE Filed Jan. 21, 1938 16'Sheets-Sheet 1 Zmnentor Gunnar ch01! Hi: (Ittorneg Jan. 27, 1942. G. NELSON 2,270,960

ACCOUNTING MACHINE Filed Jan. 21, 1938 16 Sheets-Sheet 2 FIG. 3

Accounf No. 47

Account No. 41'

ooodpooo Ledger Card.

Gunnar Nehon "is Gttomeg Jan. 27, 1942. I G. NELSON 2,270,950

\ ACCOUNTING MACHINE Filed Jan. 21/1958 16 Sheets-Sheet s Zhwentor Gunnar Nelaon Hi: (Ittomeg Jan. 27, 1942. GQNELSON ACCOUNTING MACHINE .Fi l ed Jan. 21, 1938 16 Sheets-Sheet 4 ZSnnQntor Guam Nehon y W M I-lh attonieg Jan. 27, 1942.

G. NELSON ACCOUNTING MACHINE Filed Jan. 21, 1938 16 Sheets-Sheet s Zhwentor Gunnar Nehon His (Ittorneg Jan. 27,. 1942.

G. NELSON I ACCOUNTING MACHINE l6 Sheets-Sheet 6 Filed Jan. 21, 1938 P UE Jan. 27, 1942. e. NELSON ACCOUNTING MACHINE Filed Jan. 21, 1938 16 Sheets-Sheet 7 amped on'wnooay Jan. 27; 1942. GQNELSON ACCOUNTING MACHINE Filed Jan, 21, 1938 16 Sheets-Sheet 8 FIG; 22

Bu s? 20 inventor Gunnar Nelson Jan. 27, 1942. G. NELSON 2,270,960

ACCOUNTING MACHINE File dJan. 21, 19:58 1e Sheets-Sheet 1o 3nventor Gunnar Nelson Gttomeg Jan. 27,- 1942.

G. NELSON I,

ACCOUNTING MACHINE Filed Jan. 21, 1.938 l6 Sheets-Sheet 11 Mn 1 MN n n n D G His Gttomeg ,Jan. 27; 1942. a; NELSON ACCOUNTING MACHINE filed Jan. 21, 1938 16 Sheets-Sheet 12 an: m li now an His (Ittomeg Jan. 27, 1942. e. NELSON ACCOUNTING MACHINE Filed Jail. 21, 1938 16 Sheets-Sheet l3 rn B mm m e r v" .w n t 3 G n .u m H G B now Jan. 27, 1942. G. NELSON 1 2,270,960

ACCOUNTING MACHINE Filed Jan. 21, 1958 16 Sheets-Sheet 14 FIG.43- +-1 CYCLE' +-]1 CYCLE v m g. I. Differenr Corn 445. 23.

Balance Toralizer.

Rear Totalizer.

m447, F1 23. From Tofalizer. 445, 9.23. BalanceTofdlizerfiesn.

4,25. Opel Balance Tofal izer Li no r- Eesef. Ope r.

Total 45 23. Tofalizer Liner.

387, 28. Indicator n 28. Old Balance FeelerResfor-i 56,Fig.l5.

Old Balance. 580, F1 .30.

New lance. saw-i 30. Transfer NewBalance (3.30. Translator Restored.

ode Discs Cam 28!, F 27. Auxilia He set 334, l. Amoum Re 188, Fig. IS. Carn'a eIJriveCam Caml68 .I9. Carrie oves,

Cum 202, Fig. larorward Movement Rearward I of Movement m 6'. l.

nl'i Hammer Slecfion. 5, I.

m33,il7. Fig.6 ufchDise 403. Fig.28.

Transmifler Rocks.

l Transmiffer Shi 3nventor Gunnar Nelnon His Gttorneg CamBL Fg.6, Clurch Release. m8 6, I0-

Senses.

g. I. Release K Jan. 27, 1942. cs. NELSON 2,270,960

ACCOUNTING MACHINE Filed Jan. 21, 193s; IS SheetS-Sheet 15 III F fere M l.

lance T o+a in r: Cam RearTo'fa l IZC r.

To'ralizer-Resct \ner.

ResgfOper. 4

TflalizerLock: v

451E 3 Tofalizer Liner. Cam38'7. F1928 Indicator Lmey 387. Fig.26. Old

Feeler PicKU Old lance.

Cam 580. Fi I Punch New nce.

0. Transfer Balance.

m |"I. 9.30. Tra ns|a+or Resrcred.

as. Fig. e Di DI Auxilia fieser.

9' Carr: enrlve Cam.

m| Corfu: 6 oves.

m I g. lufch i ment "1 Tra nsm'lfl'er Rocks Cam F Transmit sm' ts;

Zinnentor Gunnu Nelson ZML His attqrneg Jan. 27', 1942. s. NELSON ACCOUNTING MACHINE 7 Filed Jan. 21, 1938 FlG.'45 HY CYCLE -l m Balance To lizer.

Cam 44b. Fi g.2.3. Rear Torallzer.

m .7 Front Total zer.

Cam 445. Fi .23.

451. FI .23. Tofahzer iner.

Cam

ner Cam 387- Flg.2.8. Old

Cam 560. 30.

Cum 580. Fig.3'0. Tr'a ew Cam 3!!- Fig.30.

Cam 568. 33.

Can 188 F igl9.

Cam 202R; l8. Forward ing ' l6 Sheets-Sheet l5 lnoentor Gunnu Nellon His (Iftor'neg Patented Jan; 27, 1942 ACCOUNTING MACHINE Gunnar Nelson, Dayton, Ohio, assignor to The National Cash Register Company, Dayton, Ohio, a corporation of Maryland Application January 21, 1938, Serial No. 186,107

a 27 Claims. 1 (01. 235-2) This invention relates to improvementsin cash registers, accounting machines and the like, and is more particularly directed to such a machine provided with automaticmeans totake data from 4 record material having perforations or control points.

The machine of the instant invention contains amount keybanks, key mechanism, differential mechanism, totalizers, and driving means similar to that disclosed in United States Letters Patent No. 1,761,542, issued to Bernis M. Shipley, to which referencewill be made from time to time for more complete description.

The machine is intended to--be used for keeping duplicate records of a debtor-creditor account between two persons; Records of account are printed in duplicate by themachine on associated record materials, those being retained by the'owner ordinarily being kept on ledger cards and those being retained by the customer ordinarily being kept in passbooks.

machine on each transaction, the machine printing on each the old-balance, the new transaction, and the new balance, and perforating the new balance on the ledger card. In the embodiment of the invention hereimdisclosed, a new ledger,

card and passbook are used on each transaction.

It is the principal object of this invention to provide mechanism, that is fully automatic and proof against operators errors, for comparing identifying'perforations on associated record materials such as a ledger card and a passbook for the purpose of making certain that they pertain to the same account. These perforations in the record materials are fread or explored by feelers. If the perforations on the supposedly associated record material are,in agreement, the machine is automatically unlocked and proceeds with itsmalnor accounting operation. If the identifying perforations are not in agreement the machine remains looked as concerns its main operation. Heretofore' to accomplish such a result 'it has been necessary-for the operator to perform some function,,such as setting up the account number on the machine, after which condition,-

ingprocess the machine would determine whether or not inserted record material bore equivalent perforated symbols. As the machine compares mechanically the perforated symbols of Both 'a' ledger card and a passbook'are inserted in the balance, by means of feelers, from perforations on record material whereby data so picked up is low entered into totalizers through the same differen tials and keybanks as data entered into the totalizers under manipulative key control, thus mak- 11 ing a more flexible machine and eliminating certain independent operations heretofore essential.

Another object of the invention is to provide means for transmitting to the keybanks the data picked up from the perforations by an internally geared, laterally moving transmitting mechanism whereby it is unnecessary to have each feeler coupled separately with the keybank, thus saving multiplicity of parts and conserving space.

Another object of the invention is to provide a novel mechanism for translating perforated symbols so that by use. of an auxiliary set of spring urged keys the differentials may be set according to equivalent "numerical positions.

Another object of the invention. is to provide a novel means for transmitting and translating differential positions representing numbers to perforations in record material representing the same data.

Another object of the invention is to provide a remote control means for differentially setting selecting means for controlling perforating mechanism consisting of ring gears having internally geared shafts and pinicns.

Another object of the invention is to provide a machine that will verify the identity of supposedly associated record materials,- pick up an old balance from record material, add to it the new manually selected data, determine the new balance, print the three items on the associated record material, perforate the new balance on one of the record materials, add the old balances in one totalizer line and add the new balances and. new transactions in another totalizer line theassociated record materialathe possibilityof error in recording on una'ssociated record ma terlals is eliminated.

Another object of this invention is to provide an improved mechanism for picking up the old the drawings fwhich in an uninterrupted operation without anyact being required by the operator except to insert the record material, enter the new transaction on, the amount keys,- and start the driving means. With these and incidental'objects in'view, the invention includes certain novellfeatures of constructi'on and combinations of parts, the essential elements of which are set forth in appended claims and a preferred form or embodiment of which is hereinafter described with reference to accompany and form a part of this specification.

In the figures: Fig. 1 isthe rear half of the machine as viewed from the, right side, part in elevation and part in section.

Fig. 2 is the front half of the machine as viewed from the right side, part in elevation and part in section.

Fig. 3 shows a typical ledger card.

Fig. 4 shows a typical passbook.

Fig. 5 is a plan view of the machine with the keyboard, differentials and totalizers removed and the right side broken away between the keybanks.

Fig. 6 shows the release and locking mechanism for both the preliminary comparing operation and the main operation together with a side elevation of the comparator.

Fig. 7 is a detail view of the release mechanism for the preliminary comparing operation.

Fig. 8 shows the pawl for resiliently keeping the crankshaft in home position. a

Fig. 9 shows the comparator analyzing mechanism, as viewed from the front of the comparator, with parts removed.

Fig. 10 shows the cam and follower for causing the sensing movement of the comparator feelers.

Fig. 11 shows the cam and follower for moving the latch bar to analyze the condition of the comparator.

Fig. 12 is a front elevation of the comparator.

Fig. 13 is a plan view of the comparator.

Fig. 14 is a plan view of the old balance pickup feelers, the transmitter, and the translator setting pawls.

Fig. 15 is a right side elevation of the mechanism shown in Fig. 14, together with the mechanism for causing the sensing movement of the old balance pickup feelers.

Fig. 16 is a detail view of the old balance pickup feeler mechanism, in rear elevation.

Fig. 17 is a representation or the code used for perforating the numbers in a decimal order.

Fig. 18 is a plan view or the driving elements for causing the, sensing movement of the old balance pickup feelers.

Fig. 19 shows the mechanism for moving the record material carriages to the diflerent operative positions,

Fig. 20 shows the hom'ng pawl for the main drive shaft.

Fig. 21 is a front elevation of the mechanism for moving the record material carriages, the record material carriages and the printing wheels.

Fig. 22 is a plan view of a ledger card in its carriage.

Fig. 23 is a right side elevation of the totalizers and totalizer engaging mechanism.

Fig. 24 is a detail showing of the position of the balance totalizer engaging elements when the totalizer is out of engagement.

Fig. 25 is the same as Fig. 24 but shows the balance totalizer elements in position to be engaged by the differential.

Fig. 26 is a front elevation of the totalizers and their engaging mechanisms.

Fig. 2'7 shows the key restoring and zero stop throwout mechanism for the auxiliary keys.

Fig. 28 shows in side elevation the old balance pickup mechanism, the transmitter mechanism, the translating mechanism, and the auxiliary keybank.

Fig. 29 shows the four translator plates representing one keybank.

Fig. 30 shows the new balance transfer and perforating mechanism in side elevation.

Fig. 31 shows the perforator punches, translating discs and transfer plates in front elevation.

Fig. 32 shows a plan view of the drive mechanism for the perforating and transfer mechanism.

Fig. 33 shows the details of the periorator punch and die and its driving mechanism.

Fig. 34 is a plan view of the punch and transfer translator discs. 1

Figs. 35, 36, 37, and 38 show the four translator discs for the punches representing one keybank and transfer plates and their position when selected for punching or transferring zero.

Fig. 39 is a detail view of the cam controlling the rearward motion of the record material carriages.

Fig. 40 is a plan view of the duplicate printing mechanism.

Fig. 41 shows the amount key restoring mechanism.

Fig. 4.2 is a section through a keybank showing the wide differential latch.

Figs. d3, 44, and 45 are graphs showing the relative timing of the various machine actions.

General description The drawings illustrate the novel mechanism as embodied in the type or machineused for savings banks as set forth in the Shipley Patent 1,761,542, to which reference was made, having two banks of amount keys and their differentials, three totalizer lines, the top totalizer being a balance totalizer, the front totalizer containing the total of the old balances, and the rear totalizer containing the total of the new deposits and the new balances. The number of differentials, and banks of keys may be increased as desired and it will be shown that the new mechanism herein disclosed is adapted to be expanded likewise, some of the novel features of the invention being di-- rected to that purpose.

The main drive shaft in one rotation performs one cycle of operation of the machine, and in a complete accounting operation five rotations of the main drive shaft or live machine cycles are required. In addition, there is a preliminary onecycle operation of the special record comparing mechanism to determine whether the machine shall be released for the accounting operation. This preliminary comparing operation does not rotate the main drive shaft which remains stationary unless the comparing operation causes the release or the machine, whereiupon the last 80 degrees of rotation of the crankshaft driving the mechanism for the preliminary comparing operation are coactive with the first 40 degrees of the first machine cycle 01 the main operation, the full comparing operation being equivalent to half of a complete rotation of the main drive shaft.

Only so much of the machine as disclosed in the Shipley Patent 1,761,542 as is necessary to show how the new mechanism is incorporated in and operates in combination with the old is set forth in this specification and accompanying drawings.

In general terms, the machine to be described is one particularly suited for use by tellers in savings banks or similar institutions, when a series of transactions are made at intervals on a running account between the debtor and creditor, but its use is not restricted to such institutions. This machine in addition to the ordinary function of making duplicate printed entries, in a passbook and on a ledger card, proves mechanically that the passbook and ledger card match. At the time or starting an account the depositor is given a passbook previously perforated with holes in a certain pattern which represents the number of the account. The corresponding ledger card is perforated in an equivalent pattern. In a typical transaction the teller first places both the passbook and the supposedly associated ledger card in the machine. The

amount of the deposit or withdrawal is manually set up on the keyboard and the mechanism started. The machine will compare the perforations in the ledger card with those in the passbook and if the perforations do not represent th same account number the machine will cease operating without starting its main or accounting 4 operation. Only when the records of account I represent the same account as determined by the i perforations of the account number will the machine start its main operation and therefore a positive mechanical check is made'of the card selected. Heretofore it has'been necessary for the teller to condition the machine corresponding to an account number before the machine could verify the identity of the record material.

The effort of setting up the account number and is in turn driven by gear 69 mounted on shaft ll (Figs. 5, l5, and 30). Shaft rotates twice for each rotation of the main drive shaft 6|, such being the gear ratio. Shaft 10 is either turned by a suitable handle crank or by a motor such as disclosed in United States Letters Patent No.

the likelihood of setting up the wrong account number are eliminated by the mechanism hereinafter disclosed.

If the machine proves that the ledger card and passbook match it continues operation, going through the five machine cycles of the accounting operation automatically. In the first machine cycle the deposit is added into the balance totalizer and the rear totalizer, the deposit is printed .on the. ledgercard and passbook, and the old balance is picked up from perforations on the ledger card and retained in a storage device. In

' the second machine cycle the old balance is added to the deposibin the balance totalizer, added into the 'fronttotalizer, and printed on 'the ledger card and passbook. The third machine cycle.

is for positioning and resetting the various mechanisms. In the fourth machine cycle the new balance is cleared from the balance 'totalizer and printed on. the ledger card and passbook and transmitted to the storage device. In the fifth machine cycle the new balance is taken from the Y storage device and added into the rear totalizer and perforated on the ledger card. At the end of the five machine cycles of the accounting operation the passbook contains the printed record of the transaction, and the ledger card contains I the printed record of the transaction and in addition contains perforations representing the new balance.

" Framework Figs. 1, 2, and 5 show the vertical plates 62 53 to form the main framework of the machine. Main driving mechanism The main=drive shaft 6,! (Fig. l) running from one side of themachine to the other and jourv naled in the framework plates 62, has secured thereon one set of double plate positive'drive cams 64 for each keybankJunit and its corresponding differential 241. As stated before, one

rotation of the main drive shaft 6| constitutes one cycle of machine operation and by that motion the cams 64 drivev the differentials clockthis disclosure to indicate that when the pawl 12 is thrust in the path of stop 13 preventing clockwise motion of. that part of the clutch to which it is-attached, the clutch becomes disengaged and the turning of shaft 10 will not drive the gear 69. The machine is released for starting its five machine cycles of the accounting operation by, removing the pawl 12 from the path of rotation of stop 13, and-is locked against operation by again causing pawl 12 to assume the position shown in Fig. 6.

For the purpose of comparing the ledger card and the passbook one preliminary rotation of shaft ID in its normal clockwise direction is made, constituting the preliminary or record comparing operation. This preliminary operation will now be described. i x

The comparing cycle Referring to Fig. 8 the shaft 10 has secured thereon a notched disc 14 cooperating with a spring-actuated pawl 15 to hold the shaft resiliently in home position. Also secured to the shaft 10 (Fig. ,7) by a pin'is a disc I6 having a shoulder 18 adapted to engage pawl 11 when the pawl is placed in its path, as will be explained. One of the, purposes of the pawl 15 (Fig. 8 is to normally hold the disc 16 in home position ready for the shoulder 1 8.to engage pawl 11 without a wasted free rotation of the shaft III -.as

would occur if shoulder 18 happened to be be-' yond the nose of pawl'll.

On shaft 10 is mounted a freely rotatable sleeve 79 (Fig. 7) on the left endof which is.

secured a bell crank lever 80 to the right end of which is tenoned a cam 8| (Figs.'10' and 11) also rotatably mounted on shaft 10, said cam -running from the front to the rear of the machine which are firmly joined together by cross pieces the parts are in home position asshown in Fig. '7 by a latch 83 engaging the upper extending of sprihg82. In this position the shaft 10 turns wise and counter-clockwise in a complete oscillation.

The main drive shaft lil is driven by a gear 61 (Fig- 30 which is joumaled to a stub shaft 68 supported by theright frame 62, and gear 61 consisting of a plate grooved on both faces to positively actuate two separate cam followers each of which is fastened to an associated lever.

One arm of the bell crank lever 80 (Fig. '7) has pivotally mounted thereon the before mentioned pawl TI. of bell crank lever 80 extends a spring 82 tending to draw the nose ofpawl 11 into the path of movement of notch 18. This is prevented when end of pawlTl and the upper extending arm of bell crank lever 80, holding the pawl 11 away from the path of notch 18 against the tension idly.

Latch 83 is fastened to the end of a three armed lever 84 mounted rotatably on a stud 85 (Figs. 5 and '7) supported by the framework of the machine; The lever 84 is restricted in its motion around stud 85 by the pin 86 extending J from the framework into an-elongated slot 81 in the lever 84r The lever 84 is held in extreme Between pawl 11 and the other arm clockwise position by spring 06. Downward pressure applied to the release key 69, which is on one arm of lever will rotate said lever counter-clockwise slightly, limited by slot 81 and pin 66, raise latch 63, allow spring 02 to bring pawl 11 into the path of shoulder 16 and thus allow rotation of shaft 10 to turn sleeve 10 and cam II (Figs. 10 and 11) clockwise. Another result of the operation of key 60 (Fig. 7) is to draw link 90 slightly to the rear, the purpose of which will be explained later. Bell crank lever 96 (Fig. '1) rotatably mounted on stud 85 serves the purpose of keeping the bell crank lever 80 from counterclockwise rotation when it is in home position.

One revolution of the shaft 10 will, when key 00 is depressed, rotate the sleeve 19 clockwise and carry with it the cam BI (Figs. 10 and 11). Release of key 69 (Fig. '1) meanwhile has allowed the lever 04 to move to its home position, placing latch 03 in the path of the upper extending arm of pawl 11 which upon completion of one revolution disengages the shaft 10 from the sleeve 19 and cam BI, and causes the upper extending arm of bell crank lever 80 to be stopped in home position by latch 03. This constitutes the drive for the preliminary record comparing operation.

It is during this operation that the comparing of the ledger card perforations with those of the passbook takes place and it is determined whether or not further rotation of shaft 10 will operate the main drive shaft 6I (Fig. l)

The position of lever IOI (Fig. 6) rotatably mounted on a stud I02 fastened to the frame of the machine is determinative as to whether the pawl 12 shall be withdrawn from stop 13 thus allowing the clutch to engage, other conditions being favorable, or whether the clutch shall remain disengaged. The pawl 12 is secured to one arm of a three armed lever I03 rotatably mounted on a stud I04 projecting from the framework of the machine. Spring I05 fastened to another arm of lever I03, under tension, tends to rotate the lever I03 clockwise and withdraw pawl 12, engaging the clutch. Stud I06 on the third arm of lever I03 is engaged by retaining lever I01 when the machine is at rest and prevents the clockwise rotation of the lever I03. Removal of lever I01 from-engagement with stud I06 is accomplished by the cam 8I (Figs. 6 and 11) and the link I08. Referring to Fig. 11 which shows cam ill in the rest position and the arrow showing its direction of motion, it is apparent that at approximately the 180th degree of rotation of the shaft and cam BI, the stud cam follower I09 will be drawn toward the center of shaft 10. This cam follower mounted on and projecting from link I08 causes the link to be drawn in the same direction. The forward end of link I06 is bifurcated to engage a circumferential groove in sleeve 19 serving to hold the link against lateral movement and to hold the cam follower in the cam groove. The motion to link I00 imparted by the cam causes lever IIO to turn slightly in a clockwise direction, against the tension of spring H3. Link I06 at its rear end contains an elongated slot SI engaging a pin 92 on lever IIO. Lever H0 is attached to a yoke III (Fig. 6) rotatably mounted on a shaft 266 journaled in the framework. On the other end of yoke II I is the retaining lever I01 which also will be turned clockwise with lever IIO, freeing stud I06 and permitting the lever I03 to turn clockwise in response to the tension of spring I06. Lever IOI, however, through its bifurcated rear end engages a stud II2 on pawl I2 which will prevent the clockwise motion of lever I03 if the lever "I is held stationary against a slight counter-clockwise rotation. Therefore blocking the movement of lever IOI can control the release of the main operating mechanism of the machine by permitting or preventing the clutch being engaged. This determinative point is at approximately the 280th degree of the rotation of shaft 10 and of cam 8| when stud I06 is freed. If the lever IOI is permitted slight counter-clockwise movement at this point the clutch engages. If the lever IN is kept from such motion the clutch will remain disengaged. The last degrees of rotation of cam BI moves link I00 away from shaft 10 allowing spring II3 to move retaining lever I01 into engaging position with stud I06, providing roller I I4 has not been caught by the flange I I5 on plate II6, which plate starts to rotate as soon as the clutch engages. The flange H5 is so formed that when the machine is at rest the roller may enter and leave through a break in its circumference II1, but once the main operating mechanism has started, the roller H0 is unable to leave the retaining action of the flange until the main drive shaft has made five rotations, because the flanged plate is rotated one complete turn for every five rotations of the main drive shaft, said plate being mounted on and turned by shaft IIB which operates the totalizer engaging mechanism and whose rotation will be discussed when that subject is treated. If the lever IN is prevented from rotating slightly counter-clockwise, as would happen if its forward end were held from dropping, the machine would not be released, plate II6 would re main stationary allowing stud Ill to escape, the stud I 06 would be reengaged by lever I01, and the cam 8I would turn its last 80 degrees of rotation until the latch 83 catches the pawl I1 stopping the movement of cam BI.

Clockwise movement of lever I03 (Fig. 6), causing engagement of the clutch, will cause stud I06 to move to a point out of reach of engaging motion of lever I01. To bring stud I06 into position where it may be engaged by lever I01 at the end of the fifth rotation of the main drive shaft, a link 94 pivoted to lever I03 and slidably mounted on stud 86 is rocked upward near the end of each machine cycle. The rocking motion is supplied by a stud 93 fastened to gear 61, which gear makes one rotation each machine cycle, said stud engaging a cam foot at the base of link 04. The upward thrust of the link causes lever I03 to move counter-clockwise against the tension of spring I06 bringing stud I06 into position where it may be engaged by lever I01. During the fifth rotation of the main drive shaft the lever I01 does engage stud I06 and the clutch is disengaged. During the first four rotations of the main drive shaft the stud I06 is not so engaged and the link 94 lowers after roller 93 ceases its camming action allowing pawl I2 toreturn to its ineffective position before it engages stop 13.

A link II9 (Figs. 6 and '1) pivoted to stud 92 at its rear end and bifurcated at its forward end to straddle stud moves forward when the lever IIO rotates clockwise, carrying with it pin I20 (Fig. 7). When link H9 is in the forward position the pin I20 prevents the lever 80 from turning counter-clockwise. This is a safeguard to prevent the operation of the record comparator during the accounting operation .of the machine. Situated in the front part of the machine is 

